instance method resolve_config_for_connection

# File activerecord/lib/active_record/connection_handling.rb, line 387
      def resolve_config_for_connection(config_or_env)
        raise "Anonymous class is not allowed." unless name

        connection_name = primary_class? ? Base.name : name
        self.connection_specification_name = connection_name

        Base.configurations.resolve(config_or_env)
      end